[PATCH v4] ceph: add 'lazyio' mount option to kclient
From: Xiubo Li via B4 Relay
Date: Fri Aug 21 2026 - 02:41:21 EST
From: Xiubo Li <xiubo.li@xxxxxxxxx>
Add a 'lazyio' mount option to the kernel Ceph client that enables
LazyIO globally for all regular file opens on a mount. This is the
kclient equivalent of the 'client_force_lazyio=true' config option
in the ceph-fuse userspace client.
When 'lazyio' is specified, CEPH_FILE_MODE_LAZY is automatically
added to every regular file's fmode at open time in ceph_open() and
ceph_atomic_open(), causing the I/O paths to request
CEPH_CAP_FILE_LAZYIO from the MDS. This permits buffered I/O via
the page cache even when multiple clients have the file open for
write — beneficial for HPC workloads that can tolerate relaxed
cache coherency.
The mount option is exposed as 'lazyio' / 'nolazyio' via the VFS
fsparam_flag_no mechanism and supports remount.
Link: https://tracker.ceph.com/issues/77594
Signed-off-by: Xiubo Li <xiubo.li@xxxxxxxxx>
---
The following is a test report:
=== LazyIO Multi-Client Read Test ===
(B writes → MDS revokes CACHE from A; lazyio keeps LAZYIO → buffered reads)
nolazyio: 200 MB in 0.63s -> 319.8 MB/s
lazyio : 200 MB in 0.24s -> 840.3 MB/s
=== IO500 tool ior test: ===
nolazyio lazyio
Write: 74.49 MB/s -> 185.24 MB/s
---
Changed in V4:
- Base the CACHE/BUFFER -> LAZYIO used-cap substitution on implemented,
not issued, so ceph_check_caps() holds the revoke ACK until writeback
and invalidation complete; also queue writeback when revoking LAZYIO
with dirty buffers.
- In try_get_cap_refs(), let LAZYIO substitute for missing CACHE/BUFFER
for callers that request LAZYIO, without dropping issued CACHE/BUFFER
refs when LAZYIO is unavailable.
- In handle_cap_grant(), invalidate on CACHE-then-LAZYIO revoke
sequences and flush dirty data before ACKing when LAZYIO was
covering it.
- In ceph_page_mkwrite(), wait for BUFFER/LAZYIO to be (re)granted
before dirtying the folio instead of proceeding with WR alone.
- Request LAZYIO from the netfs read path (ceph_init_request) and
ceph_renew_caps().
- Link to v3: https://patch.msgid.link/20260819-lazyio-v3-1-21110d37c4be@xxxxxxxxx
Changes in v3:
- Rework try_get_cap_refs() so a missing LAZYIO never makes a want
unsatisfiable and silently drops CACHE/BUFFER refs (degrading to sync I/O).
- Add ceph_adjust_caps_used_for_lazyio() and report LAZYIO in used caps to
the MDS when it stands in for CACHE/BUFFER.
- In handle_cap_grant(), flush dirty data before acking an LAZYIO revoke,
and invalidate when either CACHE or LAZYIO is revoked and neither remains.
- Define CEPH_O_LAZY as 00020000 (matching src/include/ceph_fs.h) and send
it in the open request flags.
- Link to v2: https://patch.msgid.link/20260701-lazyio-v2-1-9c667864805b@xxxxxxxxx
Changes in v2:
- Move LAZYIO fmode addition from ceph_init_file_info() to ceph_open() before
ceph_caps_for_mode(), so the MDS sees LAZYIO in the wanted caps at open time.
Also cover ceph_atomic_open() for the writer path.
- Add ceph_adjust_caps_used_for_lazyio() to substitute LAZYIO for CACHE/BUFFER
in used caps reported to MDS when those caps are not issued.
- Gate try_get_cap_refs() LAZYIO substitution on want & CEPH_CAP_FILE_LAZYIO
so a non-lazy fd cannot have its consistency guarantees weakened by a lazy fd
on the same inode.
- Separate revocation handling in handle_cap_grant(): BUFFER revocation always
triggers writeback; LAZYIO revocation triggers writeback only when dirty data
is held (i_wrbuffer_ref/i_wb_ref); clean cached pages fall through to the
existing invalidation path.
- Add LAZYIO to ceph_init_request() so readahead works for lazy fds.
- Fix fmode propagation: use fmode instead of req->r_fmode in ceph_open() MDS
path, and set req->r_fmode |= CEPH_FILE_MODE_LAZY for both ceph_open() and
ceph_atomic_open().
- Remove dead #ifdef O_LAZY blocks in ceph_flags_to_mode() and ceph_renew_caps().
- Link to v1: https://patch.msgid.link/20260625-lazyio-v1-1-db13078789dd@xxxxxxxxx
To: Ilya Dryomov <idryomov@xxxxxxxxx>
To: Alex Markuze <amarkuze@xxxxxxxxxx>
To: Viacheslav Dubeyko <slava@xxxxxxxxxxx>
Cc: ceph-devel@xxxxxxxxxxxxxxx
Cc: linux-kernel@xxxxxxxxxxxxxxx
---
fs/ceph/addr.c | 52 +++++++++++++++++++
fs/ceph/caps.c | 116 +++++++++++++++++++++++++++++++++++++++----
fs/ceph/file.c | 33 ++++++++++--
fs/ceph/super.c | 15 ++++++
fs/ceph/super.h | 1 +
fs/ceph/util.c | 4 --
include/linux/ceph/ceph_fs.h | 1 +
7 files changed, 202 insertions(+), 20 deletions(-)
diff --git a/fs/ceph/addr.c b/fs/ceph/addr.c
index 0a86f672cc09..ce105c4b02f4 100644
--- a/fs/ceph/addr.c
+++ b/fs/ceph/addr.c
@@ -491,6 +491,10 @@ static int ceph_init_request(struct netfs_io_request *rreq, struct file *file)
rreq->netfs_priv = priv;
return 0;
}
+
+ /* If this is a lazy fd, also try to get LAZYIO caps */
+ if (fi->fmode & CEPH_FILE_MODE_LAZY)
+ want |= CEPH_CAP_FILE_LAZYIO;
}
/*
@@ -2055,6 +2059,30 @@ static vm_fault_t ceph_filemap_fault(struct vm_fault *vmf)
return ret;
}
+/*
+ * Return true if the MDS has issued us a cap that covers buffered
+ * dirtying: either BUFFER, or LAZYIO (as long as LAZYIO itself is not
+ * being revoked). This mirrors the conditions under which
+ * try_get_cap_refs() will hand out a BUFFER or LAZYIO ref.
+ */
+static bool ceph_have_dirtyable_caps(struct inode *inode)
+{
+ struct ceph_inode_info *ci = ceph_inode(inode);
+ int have, implemented;
+ bool ret = false;
+
+ spin_lock(&ci->i_ceph_lock);
+ have = __ceph_caps_issued(ci, &implemented);
+ if (have & CEPH_CAP_FILE_BUFFER) {
+ ret = true;
+ } else if ((have & CEPH_CAP_FILE_LAZYIO) &&
+ !((implemented & ~have) & CEPH_CAP_FILE_LAZYIO)) {
+ ret = true;
+ }
+ spin_unlock(&ci->i_ceph_lock);
+ return ret;
+}
+
static vm_fault_t ceph_page_mkwrite(struct vm_fault *vmf)
{
struct vm_area_struct *vma = vmf->vma;
@@ -2093,6 +2121,7 @@ static vm_fault_t ceph_page_mkwrite(struct vm_fault *vmf)
else
want = CEPH_CAP_FILE_BUFFER;
+retry_caps:
got = 0;
err = ceph_get_caps(vma->vm_file, CEPH_CAP_FILE_WR, want, off + len, &got);
if (err < 0)
@@ -2101,6 +2130,29 @@ static vm_fault_t ceph_page_mkwrite(struct vm_fault *vmf)
doutc(cl, "%llx.%llx %llu~%zd got cap refs on %s\n", ceph_vinop(inode),
off, len, ceph_cap_string(got));
+ /*
+ * ceph_write_iter() makes the same check and falls back to
+ * synchronous writes, but a page fault has no such fallback:
+ * dirtying the folio without BUFFER or LAZYIO would leave dirty
+ * data uncovered by any issued cap (e.g. while LAZYIO is being
+ * revoked, or after it has been released). Wait for the MDS to
+ * (re)grant a covering cap, matching how the exclude gate in
+ * try_get_cap_refs() blocks buffered writes while BUFFER is
+ * revoking.
+ */
+ if ((fi->fmode & CEPH_FILE_MODE_LAZY) &&
+ (got & (CEPH_CAP_FILE_BUFFER | CEPH_CAP_FILE_LAZYIO)) == 0) {
+ ceph_put_cap_refs(ci, got);
+ got = 0;
+ doutc(cl, "%llx.%llx %llu~%zd waiting for BUFFER or LAZYIO\n",
+ ceph_vinop(inode), off, len);
+ err = wait_event_killable(ci->i_cap_wq,
+ ceph_have_dirtyable_caps(inode));
+ if (err)
+ goto out_free;
+ goto retry_caps;
+ }
+
/* Update time before taking folio lock */
file_update_time(vma->vm_file);
inode_inc_iversion_raw(inode);
diff --git a/fs/ceph/caps.c b/fs/ceph/caps.c
index d51454e995a8..612283d84399 100644
--- a/fs/ceph/caps.c
+++ b/fs/ceph/caps.c
@@ -999,6 +999,36 @@ int __ceph_caps_used(struct ceph_inode_info *ci)
return used;
}
+/*
+ * Substitute LAZYIO for CACHE/BUFFER when they are not issued.
+ * If we have LAZYIO but not CACHE/BUFFER, report LAZYIO as used instead
+ * so the MDS knows we're fine with the weaker consistency guarantee.
+ *
+ * Base the substitution on "implemented" rather than "issued": while
+ * LAZYIO is being revoked, "issued" no longer contains it but
+ * "implemented" still does. If used reverted to CACHE/BUFFER at that
+ * point, ceph_check_caps() would see (revoking & cap_used) == 0 and
+ * ACK the revoke while dirty or stale pages were still present. Only
+ * once the revoke is ACKed does "implemented" drop LAZYIO.
+ */
+static inline int ceph_adjust_caps_used_for_lazyio(int used, int issued,
+ int implemented)
+{
+ if (!(used & (CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_BUFFER)))
+ return used;
+ if (!(implemented & CEPH_CAP_FILE_LAZYIO))
+ return used;
+ if (!(issued & CEPH_CAP_FILE_CACHE)) {
+ used &= ~CEPH_CAP_FILE_CACHE;
+ used |= CEPH_CAP_FILE_LAZYIO;
+ }
+ if (!(issued & CEPH_CAP_FILE_BUFFER)) {
+ used &= ~CEPH_CAP_FILE_BUFFER;
+ used |= CEPH_CAP_FILE_LAZYIO;
+ }
+ return used;
+}
+
#define FMODE_WAIT_BIAS 1000
/*
@@ -2049,6 +2079,10 @@ void ceph_check_caps(struct ceph_inode_info *ci, int flags)
* usually because they have outstanding references).
*/
issued = __ceph_caps_issued(ci, &implemented);
+
+ /* substitute LAZYIO for CACHE/BUFFER when they are not issued */
+ used = ceph_adjust_caps_used_for_lazyio(used, issued, implemented);
+
revoking = implemented & ~issued;
want = file_wanted;
@@ -2164,10 +2198,13 @@ void ceph_check_caps(struct ceph_inode_info *ci, int flags)
* at most 5 seconds. That means the MDS needs to wait at
* most 5 seconds to finished the Fb capability's revocation.
*
- * Let's queue a writeback for it.
+ * Let's queue a writeback for it. The same applies when
+ * LAZYIO is revoked while it was covering for BUFFER
+ * (dirty pages exist, but BUFFER isn't issued).
*/
if (S_ISREG(inode->i_mode) && ci->i_wrbuffer_ref &&
- (revoking & CEPH_CAP_FILE_BUFFER))
+ (revoking & (CEPH_CAP_FILE_BUFFER |
+ CEPH_CAP_FILE_LAZYIO)))
queue_writeback = true;
}
@@ -2905,9 +2942,45 @@ static int try_get_cap_refs(struct inode *inode, int need, int want,
}
snap_rwsem_locked = true;
}
- if ((have & want) == want)
+ /*
+ * Allow LAZYIO to act as a substitute for
+ * CACHE or BUFFER when those caps are not
+ * issued, but only for callers that
+ * explicitly requested LAZYIO. This
+ * prevents a non-lazy fd from having its
+ * CACHE/BUFFER wants satisfied by LAZYIO
+ * on an inode where a different fd is lazy.
+ *
+ * A missing LAZYIO cap, however, must never
+ * cost us the CACHE/BUFFER refs that are
+ * actually issued: the MDS only grants
+ * LAZYIO for files opened with CEPH_O_LAZY
+ * and it can be revoked at any time. If we
+ * made the whole want unsatisfiable without
+ * it, the I/O paths would silently drop
+ * CACHE/BUFFER (e.g. take no wrbuffer refs)
+ * and degrade to synchronous writes.
+ */
+ if ((have & (want & ~CEPH_CAP_FILE_LAZYIO)) ==
+ (want & ~CEPH_CAP_FILE_LAZYIO)) {
+ *got = need | (want & ~exclude &
+ ~CEPH_CAP_FILE_LAZYIO);
+ if ((want & CEPH_CAP_FILE_LAZYIO) &&
+ (have & CEPH_CAP_FILE_LAZYIO) &&
+ !(exclude & CEPH_CAP_FILE_LAZYIO))
+ *got |= CEPH_CAP_FILE_LAZYIO;
+ } else if ((want & CEPH_CAP_FILE_LAZYIO) &&
+ (have & CEPH_CAP_FILE_LAZYIO) &&
+ !(exclude & CEPH_CAP_FILE_LAZYIO) &&
+ ((have & want) ==
+ (want & ~(CEPH_CAP_FILE_CACHE |
+ CEPH_CAP_FILE_BUFFER)))) {
+ /*
+ * LAZYIO substitutes for missing CACHE/BUFFER;
+ * it is already included via (want & ~exclude).
+ */
*got = need | (want & ~exclude);
- else
+ } else
*got = need;
ceph_take_cap_refs(ci, *got, true);
ret = 1;
@@ -3525,13 +3598,20 @@ static void handle_cap_grant(struct inode *inode,
/*
- * If CACHE is being revoked, and we have no dirty buffers,
- * try to invalidate (once). (If there are dirty buffers, we
- * will invalidate _after_ writeback.)
+ * Check the revocation of *both* CACHE and LAZYIO, because
+ * CACHE may have been revoked earlier and cap->issued no
+ * longer contains it -- at that point only LAZYIO was
+ * covering us. If LAZYIO is now also being revoked and no
+ * cache cap remains, we must invalidate the page cache.
+ * Without this, a CACHE-revoked-then-LAZYIO-revoked sequence
+ * leaves stale pages in memory until the next periodic
+ * check_caps (up to 60s). Also invalidate when we have no
+ * dirty buffers (if dirty, invalidate after writeback).
*/
if (S_ISREG(inode->i_mode) && /* don't invalidate readdir cache */
- ((cap->issued & ~newcaps) & CEPH_CAP_FILE_CACHE) &&
- (newcaps & CEPH_CAP_FILE_LAZYIO) == 0 &&
+ ((cap->issued & ~newcaps) &
+ (CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO)) &&
+ !(newcaps & (CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO)) &&
!(ci->i_wrbuffer_ref || ci->i_wb_ref)) {
if (try_nonblocking_invalidate(inode)) {
/* there were locked pages.. invalidate later
@@ -3675,6 +3755,7 @@ static void handle_cap_grant(struct inode *inode,
/* check cap bits */
wanted = __ceph_caps_wanted(ci);
used = __ceph_caps_used(ci);
+ used = ceph_adjust_caps_used_for_lazyio(used, cap->issued, cap->implemented);
dirty = __ceph_caps_dirty(ci);
doutc(cl, " my wanted = %s, used = %s, dirty %s\n",
ceph_cap_string(wanted), ceph_cap_string(used),
@@ -3702,13 +3783,26 @@ static void handle_cap_grant(struct inode *inode,
doutc(cl, "revocation: %s -> %s (revoking %s)\n",
ceph_cap_string(cap->issued), ceph_cap_string(newcaps),
ceph_cap_string(revoking));
+ /*
+ * If BUFFER is being revoked and we have dirty data,
+ * trigger writeback before acking. When LAZYIO was
+ * covering for BUFFER (BUFFER not issued, dirty refs
+ * held), also trigger writeback. Clean cached pages
+ * under LAZYIO are handled by queue_invalidate below.
+ */
if (S_ISREG(inode->i_mode) &&
(revoking & used & CEPH_CAP_FILE_BUFFER)) {
writeback = true; /* initiate writeback; will delay ack */
revoke_wait = true;
+ } else if (S_ISREG(inode->i_mode) &&
+ (revoking & used & CEPH_CAP_FILE_LAZYIO) &&
+ (ci->i_wrbuffer_ref || ci->i_wb_ref)) {
+ /* LAZYIO was covering for dirty data — flush first */
+ writeback = true;
+ revoke_wait = true;
} else if (queue_invalidate &&
- revoking == CEPH_CAP_FILE_CACHE &&
- (newcaps & CEPH_CAP_FILE_LAZYIO) == 0) {
+ (revoking & (CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO)) &&
+ !(newcaps & (CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO))) {
revoke_wait = true; /* do nothing yet, invalidation will be queued */
} else if (cap == ci->i_auth_cap) {
check_caps = 1; /* check auth cap only */
diff --git a/fs/ceph/file.c b/fs/ceph/file.c
index d54d71669176..4d5afd1e0277 100644
--- a/fs/ceph/file.c
+++ b/fs/ceph/file.c
@@ -346,10 +346,6 @@ int ceph_renew_caps(struct inode *inode, int fmode)
flags = O_RDONLY;
else if (wanted & CEPH_CAP_FILE_WR)
flags = O_WRONLY;
-#ifdef O_LAZY
- if (wanted & CEPH_CAP_FILE_LAZYIO)
- flags |= O_LAZY;
-#endif
req = prepare_open_request(inode->i_sb, flags, 0);
if (IS_ERR(req)) {
@@ -357,6 +353,10 @@ int ceph_renew_caps(struct inode *inode, int fmode)
goto out;
}
+ if (wanted & CEPH_CAP_FILE_LAZYIO) {
+ req->r_fmode |= CEPH_FILE_MODE_LAZY;
+ req->r_args.open.flags |= cpu_to_le32(CEPH_O_LAZY);
+ }
req->r_inode = inode;
ihold(inode);
req->r_num_caps = 1;
@@ -408,6 +408,19 @@ int ceph_open(struct inode *inode, struct file *file)
doutc(cl, "%p %llx.%llx file %p flags %d (%d)\n", inode,
ceph_vinop(inode), file, flags, file->f_flags);
fmode = ceph_flags_to_mode(flags);
+
+ /*
+ * If lazyio mount option is set, enable lazyio for all regular
+ * files. Skip snapped files: snap caps never include LAZYIO,
+ * so including it in wanted would force an unnecessary MDS
+ * round-trip for every open of a snapped file.
+ */
+ if (S_ISREG(inode->i_mode) &&
+ ceph_snap(inode) == CEPH_NOSNAP &&
+ (fsc->mount_options->flags & CEPH_MOUNT_OPT_LAZYIO)) {
+ fmode |= CEPH_FILE_MODE_LAZY;
+ }
+
wanted = ceph_caps_for_mode(fmode);
if (fmode & CEPH_FILE_MODE_WR)
@@ -484,13 +497,16 @@ int ceph_open(struct inode *inode, struct file *file)
err = PTR_ERR(req);
goto out;
}
+ req->r_fmode |= fmode & CEPH_FILE_MODE_LAZY;
+ if (fmode & CEPH_FILE_MODE_LAZY)
+ req->r_args.open.flags |= cpu_to_le32(CEPH_O_LAZY);
req->r_inode = inode;
ihold(inode);
req->r_num_caps = 1;
err = ceph_mdsc_do_request(mdsc, NULL, req);
if (!err)
- err = ceph_init_file(inode, file, req->r_fmode);
+ err = ceph_init_file(inode, file, fmode);
ceph_mdsc_put_request(req);
doutc(cl, "open result=%d on %llx.%llx\n", err, ceph_vinop(inode));
out:
@@ -834,6 +850,9 @@ int ceph_atomic_open(struct inode *dir, struct dentry *dentry,
} else {
int fmode = ceph_flags_to_mode(flags);
+ if (fsc->mount_options->flags & CEPH_MOUNT_OPT_LAZYIO)
+ fmode |= CEPH_FILE_MODE_LAZY;
+
mask = MAY_READ;
if (fmode & CEPH_FILE_MODE_WR)
mask |= MAY_WRITE;
@@ -876,6 +895,10 @@ int ceph_atomic_open(struct inode *dir, struct dentry *dentry,
err = PTR_ERR(req);
goto out_ctx;
}
+ if (fsc->mount_options->flags & CEPH_MOUNT_OPT_LAZYIO) {
+ req->r_fmode |= CEPH_FILE_MODE_LAZY;
+ req->r_args.open.flags |= cpu_to_le32(CEPH_O_LAZY);
+ }
req->r_dentry = dget(dentry);
req->r_num_caps = 2;
mask = CEPH_STAT_CAP_INODE | CEPH_CAP_AUTH_SHARED;
diff --git a/fs/ceph/super.c b/fs/ceph/super.c
index c05fbd4237f8..0bbd38933f0e 100644
--- a/fs/ceph/super.c
+++ b/fs/ceph/super.c
@@ -177,6 +177,7 @@ enum {
Opt_wsync,
Opt_pagecache,
Opt_sparseread,
+ Opt_lazyio,
};
enum ceph_recover_session_mode {
@@ -203,6 +204,7 @@ static const struct fs_parameter_spec ceph_mount_parameters[] = {
fsparam_flag_no ("fsc", Opt_fscache), // fsc|nofsc
fsparam_string ("fsc", Opt_fscache), // fsc=...
fsparam_flag_no ("ino32", Opt_ino32),
+ fsparam_flag_no ("lazyio", Opt_lazyio),
fsparam_string ("mds_namespace", Opt_mds_namespace),
fsparam_string ("mon_addr", Opt_mon_addr),
fsparam_flag_no ("poolperm", Opt_poolperm),
@@ -593,6 +595,12 @@ static int ceph_parse_mount_param(struct fs_context *fc,
else
fsopt->flags |= CEPH_MOUNT_OPT_SPARSEREAD;
break;
+ case Opt_lazyio:
+ if (result.negated)
+ fsopt->flags &= ~CEPH_MOUNT_OPT_LAZYIO;
+ else
+ fsopt->flags |= CEPH_MOUNT_OPT_LAZYIO;
+ break;
case Opt_test_dummy_encryption:
#ifdef CONFIG_FS_ENCRYPTION
fscrypt_free_dummy_policy(&fsopt->dummy_enc_policy);
@@ -749,6 +757,8 @@ static int ceph_show_options(struct seq_file *m, struct dentry *root)
seq_puts(m, ",nopagecache");
if (fsopt->flags & CEPH_MOUNT_OPT_SPARSEREAD)
seq_puts(m, ",sparseread");
+ if (fsopt->flags & CEPH_MOUNT_OPT_LAZYIO)
+ seq_puts(m, ",lazyio");
fscrypt_show_test_dummy_encryption(m, ',', root->d_sb);
@@ -1410,6 +1420,11 @@ static int ceph_reconfigure_fc(struct fs_context *fc)
else
ceph_clear_mount_opt(fsc, SPARSEREAD);
+ if (fsopt->flags & CEPH_MOUNT_OPT_LAZYIO)
+ ceph_set_mount_opt(fsc, LAZYIO);
+ else
+ ceph_clear_mount_opt(fsc, LAZYIO);
+
if (strcmp_null(fsc->mount_options->mon_addr, fsopt->mon_addr)) {
kfree(fsc->mount_options->mon_addr);
fsc->mount_options->mon_addr = fsopt->mon_addr;
diff --git a/fs/ceph/super.h b/fs/ceph/super.h
index afc89ce91804..aec2eb4d0256 100644
--- a/fs/ceph/super.h
+++ b/fs/ceph/super.h
@@ -45,6 +45,7 @@
#define CEPH_MOUNT_OPT_ASYNC_DIROPS (1<<15) /* allow async directory ops */
#define CEPH_MOUNT_OPT_NOPAGECACHE (1<<16) /* bypass pagecache altogether */
#define CEPH_MOUNT_OPT_SPARSEREAD (1<<17) /* always do sparse reads */
+#define CEPH_MOUNT_OPT_LAZYIO (1<<18) /* force lazyio for all file opens */
#define CEPH_MOUNT_OPT_DEFAULT \
(CEPH_MOUNT_OPT_DCACHE | \
diff --git a/fs/ceph/util.c b/fs/ceph/util.c
index 2c34875675bf..be3db3f20344 100644
--- a/fs/ceph/util.c
+++ b/fs/ceph/util.c
@@ -73,10 +73,6 @@ int ceph_flags_to_mode(int flags)
mode = CEPH_FILE_MODE_RDWR;
break;
}
-#ifdef O_LAZY
- if (flags & O_LAZY)
- mode |= CEPH_FILE_MODE_LAZY;
-#endif
return mode;
}
diff --git a/include/linux/ceph/ceph_fs.h b/include/linux/ceph/ceph_fs.h
index 69ac3e55a3fe..01fd5f6647c8 100644
--- a/include/linux/ceph/ceph_fs.h
+++ b/include/linux/ceph/ceph_fs.h
@@ -414,6 +414,7 @@ extern const char *ceph_mds_op_name(int op);
#define CEPH_O_CREAT 00000100
#define CEPH_O_EXCL 00000200
#define CEPH_O_TRUNC 00001000
+#define CEPH_O_LAZY 00020000
#define CEPH_O_DIRECTORY 00200000
#define CEPH_O_NOFOLLOW 00400000
---
base-commit: 9fc75b71fdd38465c76c6f6a884cdd4ae3c72d90
change-id: 20260625-lazyio-6987f73c557f
Best regards,
--
Xiubo Li <xiubo.li@xxxxxxxxx>